Type species of Cabreramys (Massoia and Fornes, 1967), a taxon considered a junior synonym of Bolomys by Reig (1978, 1987) and of Necromys by Massoia and Pardiñas (1993). Formerly contained benefactus as a subspecies (see above account). Geographic variation and allopatric distribution in light of late Pleistocene climatic changes discussed by Galliari and Pardiñas (2000). The strong morphometric differentiation between and probable long-term isolation of the named populations, as demonstrated by the latter authors, recommend reconsideration of their status using other information sources.